JPWO2019155756A1 - Controller for multi-group multi-phase rotating electric machine and drive for multi-group multi-phase rotating electric machine - Google Patents

Abstract

A controller 1 of a multi-group poly-phase rotating electric machine for controlling a multi-group poly-phase rotating electric machine, wherein windings of different groups are arranged at positions having different mechanical spatial phases by 180/N (N is an integer of 2 or more). And a control target calculation unit 410 that calculates an initial current command value of each phase based on the torque command value, and a spatial mode of electromagnetic force due to magnetic flux density variation with respect to rotation periodicity during rotation of the multi-group multi-phase rotating electric machine. A correction coefficient calculation unit 411 for calculating each group correction coefficient corresponding to each group from M (M is 0 or a positive integer), and for each phase corrected based on the initial current command value and each group correction coefficient. A current command value correction unit 412 that calculates a current command value is provided.

Description

The present invention relates to an electric power steering device, a control device for a multi-group multi-phase rotating electric machine used in an elevator hoisting machine and the like, and a drive device for the multi-group multi-phase rotating electric machine.

A control device for controlling a multi-group multi-phase rotating electric machine using a plurality of three-phase inverters has been disclosed (for example, see Patent Document 1). Further, there is disclosed a control device that corrects the current value of each phase in order to reduce torque ripple that occurs in a rotating electric machine that has a shaft with eccentricity (for example, refer to Patent Document 2).

Japanese Patent Publication No. 2013-504293 (page 4-5, FIG. 12) JP, 2009-296706, A (6-7 pages, Drawing 1).

Usually, an eccentricity or a circularity deviation of the stator or the rotor occurs due to a manufacturing error of the rotating electric machine. Due to such eccentricity or deviation of circularity, the gap between the stator and the rotor changes during one rotation cycle. Therefore, there is a problem in that the magnetic flux density varies during one rotation cycle, causing vibration and noise.

With the conventional control method for a rotating electric machine, it is not possible to correct the variation in the magnetic flux density that occurs during one rotation cycle, and it is not possible to suppress the generation of vibration and noise.

The present invention has been made to solve the above problems, and even if the eccentricity or the circularity deviation of the stator or rotor occurs due to the manufacturing error of the rotating electric machine, the magnetic flux generated during one rotation cycle. The purpose is to correct variations in density. As a result, it is possible to suppress the generation of vibration and noise of the rotary electric machine.

A control device for a multi-group polyphase rotary electric machine according to the present invention,
A controller for a multi-group poly-phase rotating electric machine for controlling a multi-group poly-phase rotating electric machine, wherein windings of different groups are arranged at positions having different mechanical spatial phases by 180/N (N is an integer of 2 or more). ,
A control target calculation unit that calculates an initial current command value for each phase based on the torque command value,
Correction coefficient for calculating each group correction coefficient corresponding to each group from the spatial mode M (M is 0 or a positive integer) of the electromagnetic force caused by the magnetic flux density variation with respect to the rotation periodicity of the multi-group multi-phase rotating electric machine during rotation A calculator,
A current command value correction unit that calculates a current command value for each phase that is corrected based on the initial current command value and each group correction coefficient is provided.

This invention is
Correction coefficient for calculating each group correction coefficient corresponding to each group from the spatial mode M (M is 0 or a positive integer) of the electromagnetic force caused by the magnetic flux density variation with respect to the rotation periodicity of the multi-group multi-phase rotating electric machine during rotation A calculator,
Since it includes a current command value correction unit that calculates the current command value of each phase corrected based on the initial current command value and each group correction coefficient,
Even if the eccentricity or the circularity deviation of the stator or the rotor occurs due to the manufacturing error of the rotating electric machine, it is possible to correct the variation of the magnetic flux density generated during one rotation cycle.

It is a cross-sectional schematic diagram of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the connection of the rotary electric machine and inverter which concern on Embodiment 1 of this invention. 1 is a schematic diagram showing a control device for a rotary electric machine according to Embodiment 1 of the present invention. 3 is a flowchart showing a flow of processing of the control device for the rotating electrical machine according to Embodiment 1 of the present invention. It is a block diagram which shows the hardware constitutions of the control apparatus of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a cross-sectional schematic diagram of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a cross-sectional schematic diagram of the rotary electric machine which concerns on Embodiment 3 of this invention. It is a cross-sectional schematic diagram of the rotary electric machine which concerns on Embodiment 4 of this invention. It is a cross-sectional schematic diagram of the rotary electric machine which concerns on Embodiment 5 of this invention.

Embodiment 1.
1 is a schematic sectional view showing the structure of a multi-group, multi-phase rotating electric machine according to Embodiment 1 of the present invention. In the present embodiment, a permanent magnet synchronous rotary electric machine of three-group three-phase distributed winding shown in FIG. 1 will be described as an example. In FIG. 1, the rotation axis direction of the rotating electric machine is the z axis, and the directions perpendicular to the z axis are the x axis and the y axis, respectively.

As shown in FIG. 1, the rotary electric machine 2 of the present embodiment includes a rotor 201 and a stator 202. The rotor 201 includes a rotor core 203, a permanent magnet 204, and a shaft 205. The rotor core 203 is formed by laminating electromagnetic steel plates. The rotor core 203 is provided with six V-shaped magnet slots 206, which form a set of two, at equal intervals in the circumferential direction. The permanent magnets 204 are inserted into the magnet slots 206, and one V-shape constitutes one pole, and the permanent magnets 204 are arranged so as to alternately constitute N poles and S poles in the circumferential direction. The shaft 205 is configured on the inner diameter side of the rotor core 203 and is press-fitted into the rotor core 203.

The stator 202 is inserted into a status lot 209 formed between 36 stator teeth 208 protruding from the annular stator yoke 207 in the inner diameter direction and adjacent stator teeth 208, and a coil is formed every 6 slots in the circumferential direction. It is composed of stator coils 210 arranged in distributed winding.

The stator coil 210 includes U1 coil, V1 coil, and W1 coil corresponding to the third phase of the first group and U2 coil, V2 coil, and W2 coil corresponding to the third phase of the second group, corresponding to the three phases of the third group. And a U3 coil, a V3 coil, and a W3 coil corresponding to the third phase of the third group.

In FIG. 1, +-notation of each stator coil indicates whether the direction of current is upward or downward in the direction perpendicular to the paper surface. Of the 36 status lots 209, the first group of three-phase coils is housed in 12 status lots 209 adjacent to each other in the circumferential direction. The 3rd phase coil of the 2nd group is housed in 12 status lots 209 adjacent to the 12 status lots 209 in which the 3 phase coil of the 1st group is housed, and the 3rd phase coil of the 3rd group remains It is stored in 12 adjacent status lots 209. In this way, the three groups of the triple three-phase coils are arranged at positions shifted by 120 degrees with respect to the mechanical angle of 360 degrees corresponding to one mechanical rotation.

FIG. 2 is a schematic diagram showing the connection between rotating electric machine 2 and inverter 3 in the present embodiment. As shown in FIG. 2, the three-phase coils of the three groups are connected to different three-phase inverters 301, 302 and 303, respectively. The three groups of three-phase coils are individually controlled by three-phase inverters 301, 302 and 303.

Next, correction for eccentricity or circularity deviation of the stator 202 or the rotor 201 will be described.

As shown in FIG. 1, the stator 202 and the rotor 201 of the rotary electric machine 2 are eccentric to each other, the stator 202 and the rotor 201 are close to each other in the +x direction, and the stator 202 and the rotor 201 are in the −x direction. Are distant from each other.

When the conventional current control is performed in such a state, the currents supplied to the three groups are controlled so as to be equal to each other, and as a result, the gap dimension becomes smaller than the reference value in the +x direction. The magnetic flux density becomes high and the gap size becomes larger than the reference value in the −x direction, so the gap magnetic flux density becomes smaller. In this case, the electromagnetic force proportional to the square of the gap magnetic flux density is superposed with the harmonic wave that increases or decreases once per mechanical angle cycle. Here, the reference value is a gap size when it is assumed that the rotating electric machine has neither eccentricity nor deviation of the circularity of the stator 202 or the rotor 201.

In the 6-pole and 36-slot rotary electric machine shown in FIG. 1, one cycle of mechanical angle corresponds to three cycles of electrical angle. Therefore, the deformation of the electromagnetic force of the fundamental wave (first-order electrical angle space) at the electrical angle occurs at the mechanical angle. It corresponds to the space 3 order. For this reason, in this 6-pole 36-slot rotary electric machine, a deformation mode corresponding to the third-order space is generated as the lowest-order electromagnetic force except the 0th-order space, resulting in resonance at the lowest frequency. On the other hand, when the eccentricity occurs as described above, a harmonic of the electromagnetic force that increases or decreases once per mechanical cycle is superimposed, and the electromagnetic force of the spatial third order is modulated into the spatial second order and the spatial fourth order. And cause resonance. The eigenvalue of the spatial second order (mode 2) has a lower resonant frequency than the eigenvalue of the spatial third order, and in general, the resonant frequency of the lower order has a larger transfer function at resonance, which causes problems as vibration and noise. Cheap.

FIG. 3 is a schematic diagram showing the control device for the rotary electric machine according to the present embodiment. The control device 1 of the present embodiment will be described later with a control target calculation unit 410 that calculates the phase current initial value 102 of each group based on the torque command value 101 given from the outside (see step S1 in FIG. 4). Based on the correction coefficient calculation unit 411, the phase current initial value 102 of each group, and the correction coefficient 103 calculated by the correction coefficient calculation unit 411, the phase current command value 104 of each group corrected by the correction coefficient 103 is calculated. Based on the calculated current command value correction unit 412 (see step S3 in FIG. 4), the phase current command value 104 and the current value 105 of each phase of each group that is actually energized, each phase current command value 104 To a phase voltage command value 106 of each group (see step S4 in FIG. 4), and a PWM calculation unit that calculates a gate signal 107 to be output to the inverter 3 based on the phase voltage command value 106. 414 and (see step S5 of FIG. 4). Each phase current initial value 102 of each group corresponds to the current command value of each phase of each group when neither eccentricity nor circularity deviation of the stator 202 or the rotor 201 exists.

The inverter 3 is composed of the three-phase inverters 301, 302, 303 shown in FIG. The inverter 3 operates as a power converter. The inverter 3 causes a current to flow through the winding of each phase of each group based on the gate signal 107 output from the PWM calculation unit 414. The shaft 205 of the rotary electric machine 2 has a function of detecting a rotational position and sending the detected value 109 of the rotational position to the control target calculation unit 410. Further, the rotary electric machine 2 has a function of detecting a variation in magnetic flux density of each group and sending the detected value 108 to the correction coefficient calculation unit 411. In the present embodiment, the control device 1 and the inverter 3 form a drive device for the rotating electric machine 2.

The correction coefficient calculation unit 411 calculates the correction coefficient from the ratio between the average value and the magnetic flux density of each group so that the magnetic flux density of each group is averaged (see step S2 in FIG. 4). In other words, the correction coefficient calculation unit 411 corrects each group from the spatial mode M (M is 0 or a positive integer) of the electromagnetic force caused by the variation in the magnetic flux density with respect to the rotation periodicity of the rotating electric machine during rotation. Calculate the coefficient. The spatial mode M refers to a state in which the magnetic flux density varies sinusoidally M times for one mechanical rotation of the rotating electric machine. The magnetic flux density is detected by, for example, a hall sensor.

The current command value correction unit 412 multiplies the command value of each group by the correction coefficient 103 to calculate the corrected phase current command value of each group (see step S3 in FIG. 4 ).

FIG. 4 is a flowchart showing a flow of processing of the control device for the rotating electrical machine according to the present embodiment.

As shown in FIG. 4, in the control device 1, in step S1, the control target calculation unit 410 receives the torque command value 101 and the detected value 109 of the rotational position of the rotary electric machine 2, and then receives the torque command value 101 and the rotational position. The initial value 102 of each phase current of each group is calculated based on the detected value 109.

In step S2, in parallel with the process of step S1, the correction coefficient calculation unit 411 uses the detected value 108 of the magnetic flux density detected by the Hall sensor so that the magnetic flux density of each group is averaged. The average value of the magnetic flux density detection values 108 is calculated, and the correction coefficient 103 is calculated from the ratio of the average value to the magnetic flux density detection value 108 of each group.

In step S3, the current command value correction unit 412 receives each phase current initial value 102 of each group and the correction coefficient 103 of each group, and outputs each phase current initial value 102 of each group and the correction coefficient 103 of each group. The current command value 104 of each group is calculated by multiplication.

In step S4, the voltage conversion unit 413 receives the current command value 104 of each group and the detected current value 105 of each group, and based on the current command value 104 of each group and the current value 105 of each group, Each phase voltage command value 106 of each group is calculated. As a calculation method, for example, the voltage conversion unit 413 performs PI control until the difference between the current command value 104 of each group and the current value 105 of each group becomes 0, and each phase voltage command value of each group. 106 is calculated.

In step S5, the PWM calculation unit 414 calculates the gate signal 107 to be output to the inverter 3 based on each phase voltage command value 106 of each group, and controls the operation of the inverter 3.

FIG. 5 is a configuration diagram showing a hardware configuration of the control device 1. As described above, the control device 1 and the inverter 3 form a drive device. The drive device uses the rotating electric machine 2 to drive a load (not shown) connected to the rotating electric machine 2. The control device 1 includes a processor 501 and a storage device 502 as a hardware configuration, as shown in FIG. The functions of the control target calculator 410, the correction coefficient calculator 411, the current command value corrector 412, the voltage converter 413, and the PWM calculator 414 shown in FIG. It is realized by the processor 501 reading out and executing it.

Although not shown, the storage device 502 includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory. Instead of the non-volatile auxiliary storage device, an auxiliary storage device such as a hard disk may be provided.

A program is input to the processor 501 from an auxiliary storage device of the storage device 502 via a volatile storage device. The processor 501 executes the program input from the storage device 502. Further, the processor 501 outputs data such as a calculation result to a volatile storage device of the storage device 502, or outputs it to an auxiliary storage device via the volatile storage device to store the data.

The control target calculation unit 410, the correction coefficient calculation unit 411, the current command value correction unit 412, the voltage conversion unit 413, and the PWM calculation unit 414 may be realized by a processing circuit such as a system LSI.

In the control device 1 configured as described above, a state in which the gap dimension varies due to the eccentricity or the circularity deviation of the stator 202 or the rotor 201 is detected or estimated, and the electromagnetic force has a low-order mode due to the variation. Suppress the occurrence of. In the example shown in FIG. 1, the direction in which each phase current command value in the group in which the gap size is reduced due to eccentricity (+x direction) is corrected to be smaller, and the gap size is increased (-x direction) The current command value for each phase of the group in is corrected so as to be large.

In the rotating electric machine controlled by the control device 1 configured as described above, since the low-order waveform does not occur in the magnetic flux density distribution in the gap, the electromagnetic force that causes the low-order deformation does not occur, and the resonance of the low frequency occurs. It is possible to prevent the occurrence of resonance and the occurrence of resonance with a large response.

In the present embodiment, since three groups of three-phase windings are arranged at mechanical angles of 120 degrees, it is possible to detect variations in the gap magnetic flux density with three (eccentricity) vectors that are offset by 120 degrees. Therefore, it is possible to suppress the exciting force that is deformed once and the exciting force that is deformed twice for one cycle of the mechanical angle. Since the exciting force that deforms once is generated by eccentricity and the exciting force that deforms twice is generated by elliptic deformation, the control device 1 of the present embodiment can correct eccentricity and elliptic deformation, respectively. .. Further, even when the eccentricity and the elliptical deformation occur at the same time, they can be detected as the superposition, so that both can be corrected at the same time.

Next, a method of detecting the magnetic flux density variation for correction will be described. As one detection method, there is a method of using a magnetoelectric device that detects magnetism and outputs it electrically. Magnetoelectric devices include Hall sensors, TMR (tunnel magnetoresistive effect) elements, GMR (giant magnetoresistive) elements, and search coils.

For example, the Hall sensors are arranged at the center position of each group at a mechanical angle of 120 degrees and are equidistantly arranged at the tips (gap surfaces) of the stator teeth 208 of the rotary electric machine 2. In this way, it is possible to detect the variation in the gap magnetic flux density, so to reduce the variation based on the detected magnetic flux density, set the current command value for the group located at the location corresponding to the sensor with high magnetic flux density. A correction value for decreasing the correction value for increasing the current command value is calculated for a group located at a location corresponding to a sensor having a low magnetic flux density. The same effect can be obtained by using other magnetoelectric devices. Although the sensors are arranged every 120 degrees, three or more sensors may be used to reduce the detection pitch for detection.

Further, instead of the search coil, a stator coil may be used for detection. By doing so, it is possible to detect the variation in the gap magnetic flux density without adding a member dedicated to the detection.

In the correction method described above, the magnetic flux density variation may be continuously detected during operation to correct the correction coefficient at any time, or the magnetic flux density variation may be detected at the initial stage to calculate the correction coefficient. The value may be used to estimate the magnetic flux variation during operation. Since the eccentricity and the deviation from the perfect circle do not change significantly with time, it is possible to reduce the calculation inability of the control device by calculating and using the correction coefficient in the initial stage. On the other hand, when the eccentricity of whirling changes greatly with time, it is better to continuously detect variations in magnetic flux density and correct the correction coefficient as needed.

As another detection method, there is a method of calculating the correction coefficient by detecting the actual variation in the energization current of each group with respect to the current command value. Alternatively, there is a method of detecting the energization variation of each group of the no-load induced voltage and calculating the correction coefficient.

The method of correcting the magnetic flux density variation described in the present embodiment is applied when the stator 202 or the rotor 201 is composed of a combination of cores divided in the circumferential direction, and when a core punched in a straight line is bent to form an annular shape. It is especially effective when it is configured as. In addition, when a component such as a frame that is in contact with the stator 202 or the rotor 201 is formed into an annular shape by bending a flat plate component, and these components are assembled to the stator 202 or the rotor 201 by a method such as shrinkage fitting or press fitting. It is especially effective for This is because the stator and the rotor 201 configured by these methods are likely to be out of roundness.

In the present embodiment, since the eccentricity is detected from three or more detection points, the eccentricity amount and the eccentric direction can be calculated, that is, the eccentricity vector can be calculated. The detected value 109 of the rotational position may be corrected using this eccentricity vector. For correction, a correspondence table of correction values for eccentricity vectors prepared in advance is used. Only the initial correction may be applied, or the correction may be applied continuously.

In this way, the rotational position detection error due to eccentricity can be reduced, and the excitation force due to the deviation of the current command value from the ideal value (current command value when there is no eccentricity or circularity deviation) Alternatively, vibration and noise due to torque pulsation can be reduced.

Note that the control device of the present embodiment corrects the excitation force that deforms (triangularly deforms) three times at equal intervals and with the same amplitude for one cycle of the mechanical angle, because the correction values are the same in each group. It is not possible, but it is possible to correct the eccentricity superimposed on this.

Further, the excitation force that is deformed four times with respect to one cycle of the mechanical angle cannot be accurately corrected by the control device of the present embodiment because the degree of freedom in correction is insufficient.

Embodiment 2.
FIG. 6 is a schematic sectional view showing the structure of a multi-group, multi-phase rotating electric machine according to Embodiment 2 of the present invention. In the present embodiment, a permanent magnet synchronous rotary electric machine of four-group three-phase concentrated winding shown in FIG. 6 will be described as an example.

As shown in FIG. 6, the rotary electric machine 2 of the present embodiment is a 4-group 3-phase concentrated winding rotary electric machine having 8 poles and 12 slots. The phase coils of each group are arranged so as to be wound around the stator teeth 208, and the U-phase coil, the V-phase coil, and the W-phase coil are arranged in that order. One cycle of the electrical angle corresponds to a mechanical angle of 90 degrees, and the first group, the second group, the third group, and the fourth group and the windings are arranged in sequence for each one pole pair and three slots.

In the present embodiment, it is connected to the same control device as the control device shown in FIG. 3 of the first embodiment. However, the inverter 3 is composed of four three-phase inverters corresponding to the four groups, respectively. The currents flowing through the windings of each phase of each group are corrected with different correction coefficients.

In the control device configured as described above, not only eccentricity or deviation of circularity of the stator or the rotor 201 but also triangular deformation can be corrected. As a result, it is possible to suppress the generation of vibration and noise of the rotating electric machine.

Embodiment 3.
FIG. 7 is a schematic sectional view showing the structure of a multi-group, multi-phase rotating electric machine according to Embodiment 3 of the present invention. In the present embodiment, a permanent magnet synchronous rotary electric machine of two-group three-phase distributed winding shown in FIG. 7 will be described as an example.

As shown in FIG. 7, the rotary electric machine 2 of the present embodiment is a 2-group 3-phase distributed winding rotary electric machine having 8 poles and 48 slots. One group of windings is provided in the circumferential direction for each of the four poles and 24 slots, and then two groups of windings are provided.

In the present embodiment, it is connected to the same control device as the control device shown in FIG. 3 of the first embodiment. However, the inverter 3 is composed of two three-phase inverters respectively corresponding to the two groups. The currents flowing through the windings of each phase of each group are corrected with different correction coefficients.

In the control device configured in this way, the windings mechanically arranged at 180-degree opposite positions are always different groups, so that when eccentric, the stator and the rotor 201 approach and move away from each other. It can be detected and eccentricity can be corrected. As a result, it is possible to suppress the generation of vibration and noise of the rotary electric machine.

However, in the rotary electric machine according to the present embodiment, when the core is deformed in an elliptical manner, it cannot be corrected because the cores approach and move away at positions opposite to each other by 180 degrees.

Fourth Embodiment
FIG. 8 is a schematic sectional view showing the structure of a multi-group, multi-phase rotating electric machine according to Embodiment 4 for carrying out the present invention. In the present embodiment, a permanent magnet synchronous rotary electric machine of two-group three-phase distributed winding shown in FIG. 8 will be described as an example.

As shown in FIG. 8, the rotary electric machine 2 of the present embodiment is a 2-group 3-phase distributed winding rotary electric machine with 8 poles and 48 slots. One group of windings is provided in the circumferential direction for every two poles and twelve slots, then two groups of windings, then one group of windings, and then two groups of windings. And the second group winding are alternately arranged twice every 90 degrees of mechanical angle.

In the present embodiment, it is connected to the same control device as the control device shown in FIG. 3 of the first embodiment. However, the inverter 3 is composed of two three-phase inverters respectively corresponding to the two groups. The currents flowing through the windings of each phase of each group are corrected with different correction coefficients.

In the control device configured in this way, the windings mechanically arranged at 90-degree opposite positions are always in different groups, so that the approaching direction and the distant direction (minor axis direction and major axis direction) when elliptical deformation occurs. Direction) can be detected and elliptical deformation can be corrected. As a result, it is possible to suppress the generation of vibration and noise of the rotating electric machine.

However, in the rotary electric machine of the present embodiment, the same group is arranged at a position facing each other by 180 degrees. Therefore, since the eccentricity is averaged by the windings of the same group, a difference with respect to the eccentricity is unlikely to occur between the first group and the second group, and the correction cannot be performed.

Embodiment 5.
FIG. 9 is a schematic sectional view showing the structure of a multi-group, multi-phase rotating electric machine according to Embodiment 5 of the present invention. In the present embodiment, a permanent magnet synchronous rotary electric machine of two-group three-phase concentrated winding shown in FIG. 9 will be described as an example.

As shown in FIG. 9, the rotary electric machine 2 according to the present embodiment is a double-phase three-phase concentrated winding rotary electric machine with 10 poles and 12 slots. The first group winding and the second group winding are alternately arranged for each tooth in the circumferential direction with respect to the stator tooth 208.

In the present embodiment, it is connected to the same control device as the control device shown in FIG. 3 of the first embodiment. However, the inverter 3 is composed of two three-phase inverters respectively corresponding to the two groups. The currents flowing through the windings of each phase of each group are corrected with different correction coefficients.

In the control device configured as described above, since different groups of windings are mechanically arranged at positions opposite to each other by 180 degrees, it is possible to suppress generation of low-order electromagnetic force generated due to eccentricity. .. As a result, it is possible to suppress the generation of vibration and noise of the rotary electric machine.

DESCRIPTION OF SYMBOLS 1 control device, 2 rotary electric machine, 3 inverter, 201 rotor, 202 stator, 203 rotor core, 204 permanent magnet, 205 shaft, 206 magnet slot, 207 stator yoke, 208 stator teeth, 209 status lot, 210 stator coil, 410 control Target calculation unit, 411 correction coefficient calculation unit, 412 current command value correction unit, 413 voltage conversion unit, 414 PWM calculation unit.

Claims (10)

A controller for a multi-group multi-phase rotating electric machine for controlling a multi-group multi-phase rotating electric machine, wherein windings of different groups are arranged at positions having different mechanical spatial phases by 180/N (N is an integer of 2 or more). ,
A control target calculation unit that calculates an initial current command value for each phase based on the torque command value,
Correction for calculating each group correction coefficient corresponding to each group from the spatial mode M (M is 0 or a positive integer) of the electromagnetic force caused by the magnetic flux density variation with respect to the rotation periodicity during rotation of the multi-group multi-phase rotary electric machine A coefficient calculation unit,
A control of a multi-group multi-phase rotating electric machine, comprising: a current command value correction unit that calculates a current command value of each phase corrected based on the initial current command value and each group correction coefficient. apparatus. The correction coefficient calculation unit calculates each group correction coefficient by using the detected value of the magnetic flux variation of each group of the multi-group multi-phase rotating electric machine. Control device. The detection value of the magnetic flux variation of each group of the multi-group poly-phase rotating electric machine is detected at a plurality of locations in the gap between the rotor and the stator of the multi-group multi-phase rotating electric machine. The control device for a multi-group polyphase rotating electric machine according to claim 2. The detection value of the magnetic flux variation of each group of the multi-group poly-phase rotating electric machine is calculated from the eccentricity vector detected at three or more points in the gap between the rotor and the stator of the multi-group multi-phase rotating electric machine. The control device for a multi-group multi-phase rotating electric machine according to claim 2, wherein The detected value of the magnetic flux variation of each group of the multi-group multi-phase rotating electric machine is calculated from the variation of the no-load induced voltage by using the stator coil of the multi-group multi-phase rotating electric machine. Item 2. A control device for a multi-group polyphase rotating electric machine according to Item 2. The correction coefficient calculation unit calculates each group correction coefficient by using an estimated value of the magnetic flux variation of each group of the multi-group multi-phase rotating electric machine. Control device. The correction coefficient calculation unit calculates an eccentricity vector from the magnetic flux variation of each group of the multi-group multi-phase rotating electric machine, and corrects the output of the rotation angle detector. A control device for a multi-group polyphase rotating electric machine according to the item. The magnetic flux density variation with respect to the rotation periodicity during rotation of the multi-group multi-phase rotating electric machine is caused by an eccentricity error of the multi-group multi-phase rotating electric machine. A control device for a multi-group polyphase rotating electric machine according to item 1. The magnetic flux density variation with respect to the rotation periodicity during rotation of the multi-group multi-phase rotating electric machine is caused by elliptic deformation of the multi-group multi-phase rotating electric machine. A control device for a multi-group polyphase rotating electric machine according to the item. A control device for a multi-group multi-phase rotating electric machine according to any one of claims 1 to 9,
An inverter for receiving a current command correction value from the control device and flowing a current through the windings of the multi-group multi-phase rotating electric machine based on the current command correction value. Drive.

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